A calculation method for positive pressure subsidence resistance of cylindrical foundation in sandy soil

Abstract

The invention discloses a positive pressure sinking resistance calculation method suitable for a barrel foundation in sandy soil. The situation that a soil squeezing effect in a positive pressure sinking process increases a lateral pressure on an outer side barrel wall is considered; a lateral soil pressure coefficient derived based on a cavity expansion theory is compared with a lateral soil pressure coefficient given in a DNV specification; and a calculation result is closer to an actual condition. The situation that a constraint effect of an inner side wall on a soil body enables a soil plug effect to be formed in a barrel is considered; the generated soil squeezing effect is far greater than that outside the barrel; and compared with a specification method, a method for calculating a soil pressure located in the barrel and derived based on the soil plug effect has the advantage that the calculation result is closer to the actual condition. The situation that soil bodies inside andoutside a barrel body in the positive pressure sinking process present different densities is considered; the barrel wall end resistance inside and outside the barrel is calculated; especially the inner side resistance of the barrel is calculated by adopting a reversely derived frictional angle phi; the method is simple and convenient; and the calculation result is closer to the actual condition.

Description

technical field [0001] The invention relates to a calculation method of sinking resistance, in particular to a calculation method suitable for positive pressure sinking resistance of a cylindrical foundation in sandy soil. Background technique [0002] Barrel foundation is a new form of marine engineering foundation structure. Because its material cost and installation cost are lower than that of pile foundation, and it is easy to transport and install at sea, it is gradually adopted by the offshore wind power industry. At present, in the design of cylindrical foundations for offshore wind turbines, there is no clear regulation on the prediction of positive pressure sinking resistance of cylindrical foundations. People in the industry often make predictions based on the calculation method of pile foundation sinking resistance in existing codes. This method is the same as The calculation method for the bearing capacity of marine pile foundations is similar, and the result is ...

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Problems solved by technology

At present, in the design of cylindrical foundations for offshore wind turbines, there is no clear regulation on the prediction of positive pressure sinking resistance of cylindrical foundations. People in the industry often make predictions based on the calculation method of pile foundation sinking resistance in existing codes. This method is the same as The calculation method for the bearing capacity of marine pile foundations is similar, and the results are relatively conservative. Therefore, a calculation method for the positive pressure subsidence resistance of barrel foundations in sandy soil is proposed.

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